单项选择题

The phrase "highly charged" (Line 2, Para. 2) most probably means______.

A．extremely expensive
B．much cheerful
C．highly responsible
D．full of mobility and change
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单项选择题
It can be inferred from the passage that______.
A．Americans want to take part in all kinds of activities
B．curiosity is the major characteristic of Americans
C．Americans do not know how to deal with silence
D．Americans' characters are influenced by their social and geographical environments
单项选择题
We know that governments and car manufacturers______.
A．don't believe the prediction that nobody will own cars by 2020
B．are devoted to the technological innovation in car industry
C．consider the predictions made by the researchers seriously
D．have put the super-intelligent car into mass production
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